A1 Refereed original research article in a scientific journal
New shades of photochromism - yellow sodalites for the detection of blue light
Authors: Byron Hannah, Kreivilä Teppo, Colinet Pauline, Le Bahers Tangui, Lastusaari Mika
Publisher: ROYAL SOC CHEMISTRY
Publication year: 2023
Journal: Journal of Materials Chemistry. C
Journal name in source: JOURNAL OF MATERIALS CHEMISTRY C
Journal acronym: J MATER CHEM C
Volume: 11
Issue: 9
First page : 3360
Last page: 3374
Number of pages: 15
ISSN: 2050-7526
eISSN: 2050-7534
DOI: https://doi.org/10.1039/d3tc00116d
Web address : https://doi.org/10.1039/D3TC00116D
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/178946996
The absorption energy of the F-center in photochromic sodalite can be lowered by expanding the unit cell with larger ions, changing the color from pink to blue. Blue-shifting this absorption to produce other colors is not so straightforward. In this work, sodalites of the formula Na2-2xCax(Na,K)(6)(AlSiO4)(6)(Cl,S)(2) displaying white-to-yellow photochromism have been prepared and thoroughly characterized. Combining spectroscopic experiments and quantum chemical calculations, the formation of a Na2Ca entity inside the sodalite cage surrounding the trapped electron responsible for the yellow color is postulated. Optimal yellow photochromism occurs for 0.13 <= x <= 0.18, while at x >= 0.27 the formation of the by-product davyne begins to affect the structure and optical properties. Finally, the sensitivity of these materials to blue light is shown to make them well-suited as sensors for blue light over-exposure e.g. from computer screens or smart phones.
Downloadable publication This is an electronic reprint of the original article. |  |
